Technical Overview
38
IP Network Protocols
DHCP
The Phone contains a Dynamic Host Configuration Protocol (DHCP) client
that supports automatic configuration of various parameters.
If DHCP is enabled in the phone, the phone will try to obtain the following
options that are essential for the configuration of its Ethernet interface au-
tomatically from a DHCP server:
• Terminal IP Address
• Terminal Mask (Network Mask)
When the telephone requests its IP address, it sends – apart from other
information – its default host name to the DHCP server. The default host
name consists of telephone model + type + MAC address (e.g.
OP410STD0001e325a845).
The available telephone models + type are listet below:
•OP410ENT
•OP410ECO
•OP410STD
•OP410ADV
• OP420ECO
• OP420STD
• OP420ADV
•OP410ECP
• OP420ECP
The DHCP server forwards this name to the DNS server, together with the
IP address assigned.
If the phone fails to configure its Ethernet interface from a DHCP server it
will eventually time-out indicating no DHCP server found and imminent re-
start.
Other configuration options that the phone attempts to retrieve from the
DHCP server include:
• Default Route (Routers option 3)
• IP Routing/Route 1 & 2 (Static Routes option 33)
• SNTP IP Address (NTP Server option 42)
• Timezone offset (Time Server Offset option 2)
• Primary/Secondary DNS IP Addresses (DNS Server option 6)
• DNS Domain Name (DNS Domain option 15)
• SIP Addresses / SIP Server & Registrar (SIP Server option 120)
• Vendor Unique (option 43 ! page 39)
These parameters are not essential to basic network configuration the op-
eration of the phone and if not obtained will not cause a reboot. The phone
assumes these parameters are not provided by DHCP until they are re-
turned from the DHCP server. If these parameters are returned from the
DHCP server they are used and not editable in the various phone menus.
If these parameters cannot be obtained from the DHCP server the manu-
ally configured settings for these options are used.
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